package com.atgugu.realtime.app;

import com.atgugu.realtime.util.FlinkSourceUtil;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.runtime.state.hashmap.HashMapStateBackend;
import org.apache.flink.streaming.api.CheckpointingMode;
import org.apache.flink.streaming.api.datastream.DataStreamSource;
import org.apache.flink.streaming.api.environment.CheckpointConfig;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;

/**
 * @Author lizhenchao@atguigu.cn
 * @Date 2021/12/25 8:57
 */
public abstract class BaseAppV2 {
    
    public void init(int port, int p, String ck, String groupId, String topic, String ... otherTopics ){
        System.setProperty("HADOOP_USER_NAME", "atguigu");
        Configuration conf = new Configuration();
        conf.setInteger("rest.port", port);
        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment(conf);
        env.setParallelism(p);
    
        // 开启checkpoint
        env.enableCheckpointing(3000);
        env.setStateBackend(new HashMapStateBackend());
        env.getCheckpointConfig().setCheckpointStorage("hdfs://hadoop162:8020/gmall/ck/" + ck);
    
        env.getCheckpointConfig().setMaxConcurrentCheckpoints(1);
        env.getCheckpointConfig().setCheckpointingMode(CheckpointingMode.EXACTLY_ONCE);
        env.getCheckpointConfig().setCheckpointTimeout(30000);
        env.getCheckpointConfig().setMinPauseBetweenCheckpoints(100);
        env.getCheckpointConfig().enableExternalizedCheckpoints(CheckpointConfig.ExternalizedCheckpointCleanup.RETAIN_ON_CANCELLATION);
    
        // 存储了所有的topic
        ArrayList<String> topics = new ArrayList<>(Arrays.asList(otherTopics));
        topics.add(topic);
    
        HashMap<String, DataStreamSource<String>> topicToStream = new HashMap<>();
        // 从kafka读取数据
        for (String t : topics) {
            DataStreamSource<String> stream = env.addSource(FlinkSourceUtil.getKafkaSource(groupId, t));
            topicToStream.put(t, stream);
            
        }
        
        run(env, topicToStream);
        
        
        try {
            env.execute(ck);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    
    protected abstract void run(StreamExecutionEnvironment env, HashMap<String, DataStreamSource<String>> topicToStream);
}
